Guidelines for the Preparation of Transportation Impact Studies - 8th ...
Guidelines for the Preparation of Transportation Impact Studies - 8th ... Guidelines for the Preparation of Transportation Impact Studies - 8th ...
Appendix B: Guidelines for Analysis and Design of Intersection Capacity using Computer Software Introduction As a requirement for many development proposals, Halifax Regional Municipality (HRM) requires the production of a Traffic Impact Analysis. The analysis focuses on the effects a development will have on the existing street network. Such a study usually encompasses the analysis of the capacity of signalized intersections. The typical way to perform this type of analysis is to enter related data into a software package which is capable of calculating intersection capacity. Due to the complexity of this software and in order to provide a standard set of operating parameters, HRM. has developed the following base requirements: Software The following software packages are capable of performing the required analysis and are approved for Halifax Regional Municipality sanctioned traffic impact studies: HCS+ v5.21 or newer TRANSYT- 7F v.8.1 Synchro/SimTraffic version 6 CCG/CALC 2 TSIS 4.32 Other packages are available which can calculate capacity, but HRM. does not support them at the this time. However, we will accept data/output from other programs that have been converted into a format that can be read by one of the above programs. The analysis must be based on the Highway Capacity Manual 2000 or the Canadian Capacity Guide for Signalized Intersections (1995). Data The data required to perform an intersection analysis covers a broad range of attributes. This section will provide guidance on where the required data can be found and, if not available, what is considered acceptable as an input. Please remember to provide copies of all data used as an appendices to your report. Failure to do so may cause delays in the review of the traffic study, which in turn may delay the issuing of permits by other HRM departments. TISGUIDE8.WPD September 1, 2007 page B-1
Existing Traffic: Halifax Regional Municipality performs a number of manual and automated traffic counts throughout the region every year. These counts are available for the inclusion in a traffic study if requested. For information on what counts are available, please call 490-4866. Where counts are not available or are not appropriate for the study the consultant will have to conduct their own traffic counts. All existing traffic should be taken from a traffic count performed within one year of the study’s completion date. In some case where this data is not available, previous years data may be factored by background growth to estimate the current years data. The consultant should contact Traffic and Transportation to determine if factoring is appropriate in their case. Otherwise the consultant is responsible for conducting their own traffic counts. Average Annual Daily Traffic (AADT) volumes should be determined from a machine count made over a minimum 24 hour period. A 12 hour manual count, appropriately factored, may be substituted. A peak hour count must be based on a continuous count of a minimum 90 minute duration with 15 minute increments. Although HRM does not factor peak hour counts to a design hour, counts must be performed at a time of high demand or factored accordingly. Background Growth: To determine background growth the consultant should base this figure on available data from the past 5-10 years. For most major locations HRM has enough data for a consultant to determine background growth. Where this information is not available from HRM the consultant should base background growth on existing traffic volumes and approved but unbuilt developments in the area. Any assumptions should be clearly stated when determining background growth. Trip Generation: Trip generation is the process of estimating the amount of traffic to be generated by a subject development. This is usually done through the use of rates or equations expressed in terms of units of development (i.e., per dwelling unit or per thousand feet of building floor area). Acceptable Data Sources Several data sources and methods for estimating trips generated by a development are available: 1. Institute of Transportation Engineers (ITE) Trip Generation report (latest edition) containing data from observations around North America for over 20 years. 2. Prior local (HRM) studies which have been made for various reasons, but which are applicable for the purpose of estimating trip generation for site development. These studies should be approved by HRM Traffic and Transportation prior to being used. TISGUIDE8.WPD September 1, 2007 page B-2
- Page 1 and 2: Guidelines for the Preparation of T
- Page 3 and 4: Halifax Regional Municipality Guide
- Page 5 and 6: FOREWORD A transportation impact st
- Page 7 and 8: 1.0 Introduction: Transportation, D
- Page 9 and 10: 2.0 General TIS Requirements In thi
- Page 11 and 12: 3.0 Description of the Development
- Page 13 and 14: • on-street parking spaces and pa
- Page 15 and 16: or appears to be inconsistent, perh
- Page 17 and 18: 5.0 Estimation of Travel that will
- Page 19 and 20: • other factors that may be expec
- Page 21 and 22: 6.0 Evaluation of Transportation Im
- Page 23 and 24: idership/usage will be increased 5
- Page 25 and 26: to assess effects on pedestrian cro
- Page 27 and 28: 7.0.5 Evaluate the potential for ac
- Page 29 and 30: APPENDIX A Transportation Impact St
- Page 31: Supplementary Information for the T
- Page 35 and 36: All other inputs should be based on
Existing Traffic:<br />
Halifax Regional Municipality per<strong>for</strong>ms a number <strong>of</strong> manual and automated traffic counts<br />
throughout <strong>the</strong> region every year. These counts are available <strong>for</strong> <strong>the</strong> inclusion in a traffic study if<br />
requested. For in<strong>for</strong>mation on what counts are available, please call 490-4866. Where counts<br />
are not available or are not appropriate <strong>for</strong> <strong>the</strong> study <strong>the</strong> consultant will have to conduct <strong>the</strong>ir own<br />
traffic counts.<br />
All existing traffic should be taken from a traffic count per<strong>for</strong>med within one year <strong>of</strong> <strong>the</strong> study’s<br />
completion date. In some case where this data is not available, previous years data may be<br />
factored by background growth to estimate <strong>the</strong> current years data. The consultant should contact<br />
Traffic and <strong>Transportation</strong> to determine if factoring is appropriate in <strong>the</strong>ir case. O<strong>the</strong>rwise <strong>the</strong><br />
consultant is responsible <strong>for</strong> conducting <strong>the</strong>ir own traffic counts.<br />
Average Annual Daily Traffic (AADT) volumes should be determined from a machine count<br />
made over a minimum 24 hour period. A 12 hour manual count, appropriately factored, may be<br />
substituted. A peak hour count must be based on a continuous count <strong>of</strong> a minimum 90 minute<br />
duration with 15 minute increments. Although HRM does not factor peak hour counts to a<br />
design hour, counts must be per<strong>for</strong>med at a time <strong>of</strong> high demand or factored accordingly.<br />
Background Growth:<br />
To determine background growth <strong>the</strong> consultant should base this figure on available data from<br />
<strong>the</strong> past 5-10 years. For most major locations HRM has enough data <strong>for</strong> a consultant to<br />
determine background growth. Where this in<strong>for</strong>mation is not available from HRM <strong>the</strong> consultant<br />
should base background growth on existing traffic volumes and approved but unbuilt<br />
developments in <strong>the</strong> area. Any assumptions should be clearly stated when determining<br />
background growth.<br />
Trip Generation:<br />
Trip generation is <strong>the</strong> process <strong>of</strong> estimating <strong>the</strong> amount <strong>of</strong> traffic to be generated by a subject<br />
development. This is usually done through <strong>the</strong> use <strong>of</strong> rates or equations expressed in terms <strong>of</strong><br />
units <strong>of</strong> development (i.e., per dwelling unit or per thousand feet <strong>of</strong> building floor area).<br />
Acceptable Data Sources<br />
Several data sources and methods <strong>for</strong> estimating trips generated by a development are available:<br />
1. Institute <strong>of</strong> <strong>Transportation</strong> Engineers (ITE) Trip Generation report (latest edition)<br />
containing data from observations around North America <strong>for</strong> over 20 years.<br />
2. Prior local (HRM) studies which have been made <strong>for</strong> various reasons, but which are<br />
applicable <strong>for</strong> <strong>the</strong> purpose <strong>of</strong> estimating trip generation <strong>for</strong> site development. These<br />
studies should be approved by HRM Traffic and <strong>Transportation</strong> prior to being used.<br />
TISGUIDE8.WPD September 1, 2007 page B-2
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